Central Board Of Secondary Education [CBSE] — I'm complaining about my teacher

I am a student of class 12th and I just don't want to revolve my name.
I'm studying in sri Vijay vidyashram bagalur hosur, this complain is about my class teacher Ms. Prathyusha. She is a such a worse teacher, who harras the students mentally and emotionally. One day me and friend was speaking and he called me for washroom to accompany him, she asked why he is calling you?, I said just to wash our hands . But what happened to her I don't know suddenly she asked only for washing hands or other body parts ? . I don't know what she meaned . I answered, we are just going to wash our hands and not what you are thinking. Spontaneously she got anger and started to shout at me . I don't know what's wrong with her. I just not responded her and I went to washroom. Often she shows attitude towards everyone for no reason and scolds. She makes fight with some teachers and it also become a issue and it went to our school Dean sir. She often point outs me . Speaking in a worse manner. She speaks vulgarly with students. It's not only about me and there are many students like me . She will go to whatever extreme to make her right . In this way I can't focus on my studies and this is my 12 and I just need to focus on my board exam. In this manner I depressed too. If possible fire her from the school.